View : 14 Download: 0

Local atomic arrangement and electronic configuration of nanocrystalline zinc oxide hybridized with redoxable 2D lattice of manganese oxide

Title
Local atomic arrangement and electronic configuration of nanocrystalline zinc oxide hybridized with redoxable 2D lattice of manganese oxide
Authors
Kim T.W.Han A.R.Hwing S.-J.Choy J.-H.
Ewha Authors
최진호황성주한아름
SCOPUS Author ID
최진호scopus; 황성주scopus; 한아름scopusscopus
Issue Date
2007
Journal Title
Journal of Physical Chemistry C
ISSN
1932-7447JCR Link
Citation
vol. 111, no. 45, pp. 16774 - 16780
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Nanocrystalline zinc oxides were hybridized with the redoxable 2D lattice of layered manganese oxide through a hydrothermal reaction between the colloidal suspension of exfoliated manganese oxide nanosheets and the solution of zinc acetate. According to our analyses using powder X-ray diffraction, field emission-scanning electron microscopic, diffuse reflectance UV - vis, and N 2 adsorption - desorption isotherm measurements, zinc oxide nanoparticles are intercalated in the interlayer space of layered manganese oxide, leading to the formation of 1:1 ordered heterostructure with an expanded basal spacing of ∼ 1.97 nm and expanded surface area of ∼60-70 m 2/g. The Zn K-edge X-ray absorption spectroscopic (XAS) analyses clearly demonstrated that zinc ions in the nanohybrids are stabilized in tetrahedral geometry, and a post-calcination process on the as-prepared nanohybrid leads to a structural transformation of guest species from the loosely packed network of ZnO4 tetrahedra to the perfect wurzite-type ordering of ZnO4 tetrahedra. According to the Mn K-edge XAS investigation, the layered manganate lattice consisting of edge-shared MnO 6 octahedra is well maintained with distinct variations of Mn oxidation state upon exfoliation, hybridization, and post-calcination processes. This result underscores the redox capability of the present manganate-based nanohybrid, which is contrasted with the titanate-based intercalation compounds. Judging from their unique heterostructures with redoxable manganese oxide component and expanded surface area, the present nanohybrids are expected to be applicable as electrodes for supercapacitors and lithium batteries, and heterogeneous redox catalysts. © 2007 American Chemical Society.
DOI
10.1021/jp075858q
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE